<template>
  <!-- 使用 grid 网格布局，并指定列数为 2，高度占满全屏 -->
  <div class="grid grid-cols-2 h-screen">
    <!-- 默认先适配移动端，占两列，order 用于指定排列顺序，md 用于适配非移动端（PC 端）；背景色为黑色 -->
    <div class="col-span-2 order-2 p-20 md:col-span-1 md:order-1 bg-purple-400">
      <!-- 指定为 flex 布局，并设置为屏幕垂直水平居中，高度为 100% -->
      <div
        class="flex justify-center items-center h-full flex-col animate__animated animate__bounceInRight animate__fast"
      >
        <h2 class="font-bold text-4xl mb-7 text-white">kuporo-blog 博客登录</h2>
        <p class="text-white">
          一款由 Spring Boot + Mybaits Plus + Vue 3.2 + Vite 4 开发的前后端分离博客。
        </p>
        <!-- 指定图片宽度为父级元素的 1/2 -->
        <img src="@/assets/developer.png" class="w-1/2" />
      </div>
    </div>
    <div class="col-span-2 order-1 md:col-span-1 md:order-2 bg-white">
      <div
        class="flex justify-center items-center h-full flex-col animate__animated animate__bounceInLeft animate__fast"
      >
        <h1 class="font-bold text-4xl mb-5">欢迎回来</h1>
        <div class="flex items-center justify-center mb-7 text-gray-400 space-x-2">
          <!-- 左边横线，高度为 1px, 宽度为 16，背景色设置 -->
          <span class="h-[1px] w-16 bg-gray-200"></span>
          <span>账号密码登录</span>
          <!-- 右边横线 -->
          <span class="h-[1px] w-16 bg-gray-200"></span>
        </div>
        <el-form class="w-5/6 md:w-2/5" ref="formRef" :rules="rules" :model="form">
          <el-form-item prop="username">
            <!-- 输入框组件 -->
            <el-input
              size="large"
              v-model="form.username"
              placeholder="请输入用户名"
              :prefix-icon="User"
              clearable
            />
          </el-form-item>
          <el-form-item prop="password">
            <!-- 密码框组件 -->
            <el-input
              size="large"
              v-model="form.password"
              type="password"
              placeholder="请输入密码"
              :prefix-icon="Lock"
              clearable
              show-password
            />
          </el-form-item>
          <el-form-item>
            <!-- 登录按钮，宽度设置为 100% -->
            <el-button
              class="w-full mt-2"
              :loading="loading"
              size="large"
              type="primary"
              @click="onSubmit"
              >登录</el-button
            >
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script setup>
// 引入Element Plus 中的用户、锁图标
import { User, Lock } from '@element-plus/icons-vue'
import { useRouter } from 'vue-router'
import { ref, reactive, onMounted, onBeforeUnmount } from 'vue'
import { login } from '@/api/admin/user'
import { showMessage } from '@/composables/util'
import { setToken } from '@/utils/cookie'
import { useUserStore } from '@/stores/user'

const userStore = useUserStore()
const router = useRouter()
const loading = ref(false)
// 表单引用
const formRef = ref(null)
const form = reactive({
  username: '',
  password: ''
})

// 表单验证规则
const rules = {
  username: [
    {
      required: true,
      message: '用户名不能为空',
      trigger: 'blur'
    }
  ],
  password: [
    {
      required: true,
      message: '密码不能为空',
      trigger: 'blur'
    }
  ]
}

// 登陆
const onSubmit = () => {
  // 先验证form表单字段
  formRef.value.validate((valid) => {
    if (!valid) {
      console.log('表单验证不通过')
      return false
    }
    // 开始加载
    loading.value = true
    login(form.username, form.password)
      .then((res) => {
        if (res.success === true) {
          // 提示登录成功
          showMessage('登录成功')
          let token = res.data.token
          setToken(token)

          // 获取用户信息,并存储到全局状态中
          userStore.setUserInfo()
          // 跳转到后台首页
          router.push('/admin/index')
        } else {
          // 获取服务端返回的错误信息
          let message = res.message
          // 提示信息
          showMessage(message, 'error')
        }
      })
      .finally(() => {
        // 结束加载
        loading.value = false
      })
  })
}

// 按回车键后，执行登录事件
function onKeyUp(e) {
  console.log(e)
  if (e.key === 'Enter') {
    onSubmit()
  }
}

// 添加键盘监听
onMounted(() => {
  console.log('添加键盘监听')
  document.addEventListener('keyup', onKeyUp)
})

// 移除键盘监听
onBeforeUnmount(() => {
  document.removeEventListener('keyup', onKeyUp)
})
</script>
